Part 3: Digital Wallet :Microservices & APIs
In-depth low-level design of a digital wallet system. Covering microservices, APIs, and sequence diagrams for key workflows.
Part 1 : Building a Digital Wallet: A Stroll through its Innards
Part 2: Digital Wallet : The Architecture
Major Flows
Sequence diagrams are a fantastic way to understand how our different components interact with each other to fulfill specific use cases. Let’s dive into it!
Money Transfer Flow
Fraud Detection Flow
Dispute Resolution Flow
Customer Service Ticket Flow
These sequence diagrams should provide a clearer picture of the main workflows in our digital wallet system. Again, keep in mind that real-world systems may have more complexities and additional steps
LLD Microservices
Payment Microservice
This is the core of our system, handling all the payments.
Class Design
Here’s how we’ll structure our classes:
APIs
POST /payments: Process a payment
POST /refunds: Initiate a refund
Authentication Microservice
This service is responsible for ensuring that only authenticated and authorized users are able to use our system.
Class Design
APIs
POST /register: Register a new user
POST /login: Login a user and return an authentication token
POST /logout: Logout a user and invalidate their authentication token
Notification Microservice
This service is in charge of sending notifications to users.
Class Design
APIs
POST /notifications: Send a notification
Settlement Microservice
The settlement microservice is the one that ensures the successful transfer of money from one account to another.
Class Design
APIs
POST /settlements: Start the settlement process for a transaction
Fraud Detection Microservice
The fraud detection microservice is the guardian of our system, keeping an eye out for suspicious activity.
Class Design
APIs
POST /fraud_detection: Analyze a transaction for potential fraud
Dispute Resolution Microservice
Whenever there’s a dispute, this service steps in to resolve the issue.
Class Design
APIs
POST /disputes: Create a new dispute
And there you have it! We’ve now taken a close look at each microservice in our digital wallet application, complete with class designs and APIs. But remember, this is a journey, and there’s always more to learn and refine. So, keep that curiosity alive and see you in the next article!
Part 1 : Building a Digital Wallet: A Stroll through its Innards
Part 2: Digital Wallet : The Architecture
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